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Díaz Guillén, M. R. ; Moreno, K. J. ; Díaz Guillén, J. A. ; Fuentes, A .F. ; Naval, K. L. Ngai ; Garcia Barriocanal, Javier ; Santamaría Sánchez-Barriga, Jacobo ; León Yebra, Carlos | American Physical Society | 2008-09In this work we evaluate the effect of cation size on the dc activation energy needed for oxygen ion migration, E_(dc), in highly disordered pyrochlore-type ionic conductors A_(2)B_(2)O_(7). Twenty six compositions with the general formula, Ln_([...]texto impreso
Díaz Guillén, M. R. ; Díaz Guillén, J. A. ; Fuentes, A. F. ; Santamaría Sánchez-Barriga, Jacobo ; León Yebra, Carlos | American Physical Society | 2010-11-18We report on ac conductivity measurements of oxide ion conductors with composition Gd_(2)(Zr_(y)Ti_(1?y)_(2)O_(7), at temperatures between 170 and 500 K and in the frequency range 1 Hz–3MHz, and show that a crossover from a sublinear power law t[...]texto impreso
Frechero, M. A. ; Rocci, Mirko ; Schmidt, Rainer ; Díaz Guillén, M. R. ; Durá, O. J. ; Rivera Calzada, Alberto Carlos ; Santamaría Sánchez-Barriga, Jacobo ; León Yebra, Carlos | Sociedad Española de Cerámica y Vidrio | 2012-01Here we show impedance spectroscopy measurements on a bicrystal of the ionically conducting yttria stabilized zirconia (YSZ). By using micrometer sized electrodes it is possible to measure ionic transport perpendicular to a single grain boundary[...]texto impreso
Frechero, M. A. ; Rocci, Mirko ; Sánchez Santolino, Gabriel ; Salafranca, Juan ; Schmidt, Rainer ; Díaz Guillén, M. R. ; Durá, O. J. ; Rivera Calzada, Alberto Carlos ; Varela del Arco, María ; Santamaría Sánchez-Barriga, Jacobo ; León Yebra, Carlos | Nature Publishing Group | 2015-12-17The blocking of ion transport at interfaces strongly limits the performance of electrochemical nanodevices for energy applications. The barrier is believed to arise from space-charge regions generated by mobile ions by analogy to semiconductor j[...]texto impreso
Díaz Guillén, J. A. ; Díaz Guillén, M. R. ; Padmasree, K. P. ; Almanza, J. M. ; Fuentes, A. F. ; Santamaría Sánchez-Barriga, Jacobo ; León Yebra, Carlos | Sociedad Española de Cerámica y Vidrio | 2008-05Different compositions in the pyrochlore-type Gd_(2-y)La_(y)Zr_(2)O_(7) solid solution (0 ? y ? 1) were prepared at room-temperature by mechanically milling stoichiometric mixtures of the corresponding oxides. Irrespective of their lanthanum con[...]
